Transmission matrix of a uniaxial optically active crystal platelet

Conoscopic Patterns for Optically Uniaxial Gyrotropic Crystals in the Vicinity of Isotropic Point

We have presented computer simulations of conoscopic patterns occurring in optically uniaxial gyrotropic crystals in the vicinity of isotropic point for a number of sets of crystal parameters and orientations. The appearance of special directions characterized by equalization of linear and circular birefringences has been revealed.

光阱中单轴方解石单晶的平衡位置

Equilibrium positions of optically-trapped single-crystal uniaxial calcite

本研究展示了光镊对无双折射对称轴的方解石单晶在三维平移和旋转自由度上的控制，基于感应极化与入射电场相互作用的扭矩模型，确定了晶体在平衡状态下的位置，计算结果与实验观察一致。

Modal control in semiconductor optical waveguides with uniaxially patterned layers

Uniaxially patterned dielectric layers have an optical anisotropy that can be externally controlled. We study the effects of patterning the cladding or the core layer of a 3-layer optical waveguide on the polarization properties of propagating radiation. Particular attention is paid to the case when the core material is a semiconductor with optical gain. We discuss a number of devices based on incorporating an uniaxially patterned layer in the structure design, such as a polarization-insensitive amplifier, a polarizer, an optically-controlled polarization switch, and an optically controlled mo…

Terahertz active spatial filtering through optically tunable hyperbolic metamaterials

We theoretically consider infrared-driven hyperbolic metamaterials able to spatially filtering terahertz radiation. The metamaterial is a slab made of alternating semiconductor and dielectric layers whose homogenized uniaxial response, at terahertz frequencies, shows principal permittivities of different signs. The gap provided by metamaterial hyperbolic dispersion allows the slab to stop spatial frequencies within a bandwidth tunable by changing the infrared radiation intensity. We numerically prove the device functionality by resorting to full wave simulation coupled to the dynamics of charg…

非厄米单轴介质光反射中的拓扑相位奇点

Topological phase singularities in light reflection from non-Hermitian uniaxial media

该研究理论分析吸收性单轴电介质中 p 偏振光完美透射伴随的反射相位奇点，推导解析判据并揭示其拓扑荷及参数动力学。

Surface Alignment, Anchoring Transitions, Optical Properties, and Topological Defects in the Thermotropic Nematic Phase of an Organo-Siloxane Tetrapodes

We perform optical, surface anchoring, and textural studies of an organo-siloxane tetrapode material in the broad temperature range of the nematic phase. The optical, structural, and topological features are compatible with the uniaxial nematic order rather than with the biaxial nematic order, in the entire nematic temperature range -25C < T < 46C studied. For homeotropic alignment, the material experiences surface anchoring transition, but the director can be realigned into an optically uniaxial texture by applying a sufficiently strong electric field. The topological features of textures in …